GEANT4 application for the simulation of the head of a siemens primus linac

The Monte Carlo simulation of the head of a Siemens Primus Linac used at Virgen Macarena Hospital (Sevilla, Spain) has been performed using the code GEANT4 [1-2], version 9.2. In this work, the main features of the application built by our group are presented. They are mainly focused in the optimization of the performance of the simulation. The geometry, including the water phantom, has been entirely wrapped by a shielding volume which discards all the particles escaping far away through its walls. With this, a factor of four in the time spent by the simulation can be saved. An interface to read and write phase-space files in IAEA format has been also developed to save CPU time in our simulations [3-4]. Finally, some calculations of the dose absorption in the water phantom have been done and compared with the results given by EGSnrc [5] and with experimental data obtained for the calibration of the machine

GESTIÓN SOSTENIBLE DE LOS HERITAGE SITES CULTURALES: PROPUESTA DE UN MODELO

The requirement of a sustainable management of the historical heritage sites demands the design of management control models that contemplate the particularities of those sites, beyond the architectural ones. The goal of this paper is the design of a holistic, contingent and integrator model to be used by the public and/or private managers for the sustainable management. To achieve this, a thorough bibliographic review of the specialized literature has been carried out. This model does not pretend to be universal but rather a point of reference for its adaptation to the particularities of each site.La gestión sostenible de los bienes de patrimonio histórico demanda sistemas de control de gestión que contemplen sus particularidades. El objetivo de este trabajo es el diseño de un modelo de control holístico, contingente e integrador a emplear por los responsables públicos y/o privados de su gestión. Se ha realizado una profunda revisión bibliográfica de la literatura. El modelo propuesto no pretende ser universal, sino un punto de referencia para su adaptación a las particularidades propias de cada bien. Incluye indicadores que permitirán medir y valorar el logro de los objetivos

Sustainability dimensions and World Heritage Site management: the case of the Royal Alcazar of Seville, Spain

The management of a World Heritage Site must have an intergenerational and sustainable perspective that leads to the development and implementation of policies for its sustainability. The purpose of this research is to expand knowledge on whether and how World Heritage Sites include sustainability dimensions in their management processes. Sustainability is envisioned as a multifaceted concept made up of financial, heritage, sociocultural, and environmental perspectives. A case study has been carried out at the Royal Alcazar of Seville, a UNESCO World Heritage Site since 1987. The findings highlight how sustainability dimensions intertwine with its management system. They also indicate that the financial and heritage dimensions are those that remain the most developed and that socioculturaland environmental dimensions are gaining prominence in management processes. Managers of other heritage sites can benefit from this research by acknowledging the rolethat all dimensions of sustainability play in the management processes of their organisation

An aproach to the key success factors for heritage sites management

El turismo cultural está basado en la gestión y explotación, entre otros, de los bienes catalogados como patrimonio cultural. La necesidad de obtener resultados positivos ha generado una preocupación creciente por identificar los factores clave de éxito. El principal objetivo de este trabajo ha sido la identificación de los mismos, para lo que se ha realizado una revisión bibliográfica. Entendemos que la gestión de estos bienes se debe abordar de la lógica de la mejora continua y una perspectiva empresarial, interdisciplinar y estratégica, teniendo en cuenta tanto los diferentes stakeholders –con especial atención al turista- como los condicionantes derivados de las restricciones presupuestarias, la innovación y la afluencia de público. Como principales resultados, hemos identificado los siguientes factores: (1) gestión integral de la calidad, (2) control económico-financiero, (3) segmentación de los visitantes, (4) naturaleza pública de los órganos gestores, (5) competencia, (6) situación económica global.Cultural tourism is based on the management and operation of goods as cultural heritage. The need for positive outcomes has generated a growing emphasis on identifying key success factors. The main objective of this study was to identify these factors through a literature review. We understand that the management of cultural heritage assets should address the need for continuous improvement and an interdisciplinary and strategic business perspective, taking into account different stakeholders –with special attention given to tourists – as well as conditions resulting from budgetary constraints, innovation and volume of public visits. As important factors, we have identified the following: (1) integrated quality management, (2) financial-economic control, (3) visitor segmentation, (4) the public nature of management bodies, (5) competition, and (6) the global economic situation

Relativistic Coulomb excitation of the giant dipole resonance in nuclei: How to calculate transition probabilities without invoking the Liénard-Wiechert relativistic scalar and vector potentials

The conclusions extracted from a recent study of the excitation of giant dipole resonances in nuclei at relativistic bombarding energies open the way for a further simplification of the problem. It consists in the elimination of the relativistic scalar and vector electromagnetic potentials and the familiar numerical difficulties associated with their presence in the calculation scheme. The inherent advantage of a reformulation of the problem of relativistic Coulomb excitation of giant dipole resonances along these lines is discussed.Ministerio de Educación y Ciencia IS2005-01105 FPA2005-0446

Relativistic Coulomb excitation of the giant dipole resonance in nuclei: A straightforward approach

We investigate alternatives to the standard formalism used for the study of relativistic Coulomb excitation of the giant dipole resonance in nuclei. The idea is to obtain reasonable results for the probabilities of excitation and cross sections to the one-phonon and two-phonon levels avoiding the substantial complexity of the treatments exploited so far. This is achieved for the relevant range of partial waves up to bombarding energies of at least 5 GeV per nucleon. The transfer of energy to the center of mass of the excited nuclei is also investigated

Macroscopic pairing vibrational model, self-consistent pairing coupling constant, and the fifth term of von Weizs ̈ acker’s semiempirical formula

The implementation of a number-conserving formalism for pair-addition and pair-removal modes has impaired the possibility of developing an intuitive and self-consistent picture for collective pairing modes. In this paper, we show how a relaxation of this constraint leads to a unified model with true predictive poweFEDER y Ministerio de Educación y Ciencia FIS2005-01105 FPA2005-0446

Efectos de la utilización de procesos de evaluación formativa en los estudiantes de pedagogía en educación física de la Universidad de Los Lagos (Chile)

El objeto de estudio de la tesis es: "Conocer si en la Formación Inicial del Profesorado (FIP) que se lleva a cabo en la Universidad de los Lagos (Chile) se están utilizando sistemas de evaluación formativa y compartida, y en caso positivo, analizar sus efectos en los procesos de aprendizaje del alumnado". Los objetivos de la tesis están plasmados en cada uno de los cinco estudios que la componen. A continuación se exponen cada uno de ellos. 1- La evaluación formativa y compartida durante el prácticum en la formación inicial del profesorado: Análisis de un caso en Chile. 2- "¿Hay evaluación formativa y compartida en la formación inicial del profesorado en Chile? Percepción de alumnado, profesorado y egresados de una universidad" 3- "Efectos de la aplicación de un sistema de evaluación formativa en la autopercepción de competencias adquiridas en formación inicial del profesorado". 4- "Evaluación formativa en asignaturas de atención a la diversidad. Percepción del alumnado de Educación Física". 5- "Ventajas e inconvenientes de la aplicación de un sistema de evaluación formativa en la universidad chilena, e influencia en la autopercepción de competencias adquiridas"Doctorado en Investigación Transdisciplinar en Educació

Oral lichenoid lesions related to contact with dental materials: A literature review

Oral lichenoid lesions related to contact are defined as oral-cavity eruptions with an identifiable etiology, and are clinically and histologically similar to oral lichen planus. Within this group are found oral lichenoid lesions related to contact with dental materials (OLLC), the most common being those related to silver amalgam. Currently, it remains difficult to diagnose these lesions due to the clinical and histopathological similarity with oral lichen planus and other oral mucosa lesions of lichenoid characteristics. In the present paper, we carry out an updated review of the tests for, and the different characteristics of OLLC, which may aid the diagnosis. For this review, we made searches in the Pubmed® and Cochrane® databases. Among the literature we found several published papers, from which we have used review papers, case papers, cohort studies, case and control studies, and a meta-analysis study. After carrying out this review, we can conclude that the diagnosis of these lesions is still difficult and controversial. However, there are different aspects in the clinical presentation, pathological study and results obtained when replacing suspect materials, which, when taken together, may be useful when establishing the final diagnosis of OLLC

Selective nuclear transparency induced by chaotic scattering

We investigate the effects of nuclear absorption on the population of intrinsic vibrational states in scattering processes involving heavy ions. It is found that at the classical level the removal of flux assumes a qualitatively different form in the regular or chaotic regimes. Specifically, it is shown how certain reaction channels turn out to be—in the latter case—relatively insensitive to the strength of the absorptive potential. This realization has a counterpart at the quantum level where, at the chaotic layer, conditions of selective transparency in the nuclear system are enforced.DFG Bo 1109/1CONYCET Pid. 3233/92EU Network Contract CHRX-CT92-0075Comisión Interministerial de Ciencia y Tecnología PB95-0533-